Method for determining the concentration of sugar using an electrocatalytic sugar sensor

US4366033A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Gerhard Richter · Kreuztal, DE
• Gunter Luft · Achern, DE
• Ulrich Gebhardt · Langensendelbach, DE

Key dates

• Filing date: Apr 11, 1979
• Grant date: Dec 28, 1982
• Expiry date: Apr 11, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/3274
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining the concentration of sugar in the presence of interfering foreign substances, particularly for determining glucose in a body fluid, by means of an electrocatalytic sugar sensor which has a measuring electrode in which the measuring electrode is alternatingly set potentiostatically to a reactivation and a measuring potential and the current flowing during the measuring period is evaluated as the measurement signal. To prevent foreign substances from exerting an interfering influence and thereby permit a sensitive sugar determination which is reliable over an extended period of time, a hydrophilic diaphragm is arranged in front of the measuring electrode to impede the resupply of the interfering foreign substances to the measuring electrode so that a diffusion limit current adjusts itself during the reactivation phase in the oxidation of the foreign substances; and the current is evaluated with a time delay relative to the start of the measuring period.